Need help with wiring an alternator...

[Poohbair]

My buddy swapped a 94ish LT1 in his FJ 40, and has an aftermarket harness for the wiring. He cant seem to get the alternator to charge the battery, so we are looking for a little advise on where to wire these things to. None of the wiring diagrams have the same color wires as what he has. The alternator plug only has 3 female connectors, but the alternator has 4 male prongs...?

The alternator is of the hi-amp option, or so he was told by the wrecker he bought it from. The wire labels for the alt plug (from top largest wire down in the picture) are: S F L P (P doesn't have a wire, but there is a prong in the alternator for one).

Anyone know how to wire this bitch?

 

[goldwing2000]

Yank it out and trade it in for a two-wire plug!

I would guess S is signal and F is field but I can't think of anything for L. Load? Those alts only came on computer-controlled cars, so it may not work without the right ECM.

Have you tried a google search?

 

[RootBreaker]

something to search here is the pontiac trans sport upgrade... same alternator... I couldnt get it working in my truck, however I believe I may have a bad alt from the junkyard..... but will be revisiting this soon....

 

[neverendingproject]

part number 30707 should give you an idea. hard to see though http://www.painlesswiring.com/webcatalog/cat-connector.htm

 

[neverendingproject]

red goes to hot, white goes to guage, big bolt on back of Alt goes to battery

 

[goldwing2000]

part number 30707 should give you an idea. hard to see though http://www.painlesswiring.com/webcatalog/cat-connector.htm

Here's the close-up:

 

[dyeager535]

So in other words, the wires can be cut and spliced with the connector he already has. That picture is perfect.

 

[Dallin]

The alternator is a CS144. It doesn't need a computer.

S terminal is the sense wire. Hook it up to the positive battery terminal or after one of the fusible links.

L terminal turns the alternator on. It needs a 35 to 300 ohm resistor in the line and should be switched on with the ignition. You could use a small lightbulb in place of the resistor.

You probably won't need to mess with the other terminals.

 

[Poohbair]

Sweet guys, thanks for the info... he is trying to get this thing up and running by next weekend to go wheelin!

Here is a kinda old pic of what the engine is in...It is alot more put together now!

 

[afroman006]

So lets revisit this, I just got one for my 6.2 truck. I went to napa and bought a pigtail for it, with three wires, on is larger (about 12 or 10 gauge) and red, and the other two are around 16 gauge and one is brown and the other is white I think. So it soungs like the large red wire loops around to the screw terminal on the back of the alternator but I am not clear on how the other two leads hook up.

 

[Dallin]

You've got the red wire figured out. Wire the white wire to a ignition switched source with a 30 to 300 ohm resistor in the line or a light bulb. Don't use the brown wire.

 

[afroman006]

Good deal, thanks.

 

[HarryH3]

Holy big pictures Batman! Check out www.irfanview.com for some sweet FREE software for resizing pics.

 

[RootBreaker]

Holy big pictures Batman! Check out www.irfanview.com for some sweet FREE software for resizing pics.

hellz all ya need to do is use mspaint

 

[goldwing2000]

If you just loop the red wire around the output stud, you'll get crappy voltage regulation. The red sense lead should be run to the junction block on the firewall.

Read this: http://www.madelectrical.com/electricaltech/remotevoltagesensing.shtml